1.5 acres
MDC lists Gendron Lake at 1.5 acres. The entire trip can stay light and mobile; there is no need to treat it like a large-lake expedition.
Tiemeyer Park · St. Ann
Start with the map.
Then pick the pattern.
Rainbow trout, channel catfish, crappie, largemouth bass and sunfish.
GENDRON LAKE · VERIFIED LOCAL DETAILS
A 1.5-acre Tiemeyer Park lake with defined park hours.
Official sources checked September 25, 2026
Gendron is a genuinely small urban fishery. MDC lists it at 1.5 acres inside Tiemeyer Park and gives a specific 10 a.m.–9 p.m. area-hours window. The urban program adds winter trout and warm-season stocking, so the useful planning decisions are season and target species.
Tiemeyer Park access
MDC places the lake inside Tiemeyer Park at 3311 Ashby Road in St. Ann and lists area hours of 10 a.m. to 9 p.m.
Winter trout
MDC includes Gendron in the St. Louis winter trout program. That creates a cold-weather opportunity that is completely different from warm-season catfish or sunfish fishing.
Warm-season role
The urban program also includes hybrid sunfish and channel catfish stocking at participating metro lakes, including Gendron in the annual prospect information.
The clock and the season should drive the trip
- Because the posted area hours start later than many anglers expect, do not build a dawn plan around Gendron without rechecking current park information.
- During trout season, bring light line and verify the current winter rule period before selecting bait. Outside trout season, shift the plan toward catfish or sunfish instead of forcing a trout approach.
- At only 1.5 acres, make a slow shoreline pass before changing gear. A complete bank check is usually more informative than repeatedly swapping lures from one position.
Cast STL planning note: These are source-backed trip-planning recommendations, not a claim that Cast STL visited the water or caught fish there on the verification date.
Official sources used for this guide
Rules, stocking details and access can change. Use these links and posted signs as the final authority.
SEASONAL PLAN
Fish the calendar.
Not one tactic all year.
Winter brings stocked trout; spring through early fall shifts toward catfish, sunfish, crappie and bass.
WINTER TROUT
Light spinning
4–6 lb mono/fluoro. Start with a small spoon, inline spinner or 1/32–1/16 oz jig when allowed by the lake's current winter rules.
WARM SEASON
Catfish + panfish
Catfish: 12–20 lb line with a simple bottom rig. Panfish: 4–6 lb line, small jig or worm under a float.
BASS
Finesse first
8–12 lb mono/fluoro or light braid with a fluorocarbon leader. Start with a finesse worm, compact jig or small moving bait.
CURRENT RULES
Check before you keep.
- MDC lists Gendron Lake as a winter trout fishing area.
- Current special rules list an 18-inch minimum for black bass and a daily limit of 2.
- Crappie daily limit is 15 under current special rules.
- Tiemeyer Park hours and City of St. Ann access rules still apply.
OFFICIAL SOURCE
MDC is the authority.
Cast STL is a planning guide. Stocking dates, seasonal restrictions and posted rules can change.
Check MDC informationStocking hotlineQUICK ANSWERS
Fishing questions. Answered fast.
Useful first-trip answers based on the guide below. Always confirm current regulations and posted rules before fishing.
Where is Gendron Lake?
Gendron Lake is in Tiemeyer Park in St. Ann, Missouri, in the St. Louis metro area.
What can you catch at Gendron Lake?
The lake offers winter trout opportunities and warm-season fishing for species including catfish, crappie, bass and sunfish.
What line should I use at Gendron Lake?
For trout and panfish, start light around 4–6 lb. For bass, 8–12 lb mono or fluorocarbon works well; catfish setups can step up to 12–20 lb.